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Just to clarify, I can parallel the old and new without any real danger? Just shortening the life? I'll ensure voltages are equal when connected. Someone said put a light bulb in line 1st to act as a resistor while they equalize. Good idea?

It's an EPEVER Tracer 40A MPPT controller. I'd have to unmount the panels to see what they are. Yeah, it's winter so sun wasn't directly above. Can't just add a couple more? I have some room.

I bought a van that already has 2 panels on top. They're the flexible kind and are probably old. I understand these wear out quicker than their rigid counterparts. I'm wondering if I can add a couple more panels in line with them, or would it be better to just replace them since I don't know the...

I have 2 100Ah AGM batteries, one is about 3 years old, the other new, and different brands, so likely different internal structures and charge/discharge rates. My understanding is that if I parallel them, one would likely be overcharged, and one undercharged, shortening the life of both...

Thanks. I'll check out the link.